Hi @tonym68 ,
In Acumatica, there is no out-of-the-box configuration to force Inter-Branch Due To/From balancing entries to post for each individual transaction line.
By design, Acumatica's GL engine is hardcoded to summarize (net) the debits and credits for each branch pair within a batch.
Here is why your attempt didn't work, and the context behind how Acumatica handles this:
Why the COA "Detail/Summary" Setting Didn't Work
The "Post Option" (Detail vs. Summary) on the Chart of Accounts controls how subledger transactions (like AP Bills or AR Invoices) flow into the General Ledger. However, Inter-Branch balancing entries are not generated by the subledger; they are generated internally by the GL release process itself (specifically the JournalEntry balancing engine). This engine ignores the COA setting and purposefully rolls up the amounts to prevent massive GL bloat.
Hope above helps!!